Manners are a sensitive awareness of the feelings of others.
If you have that awareness, you have good manners,
no matter which fork you use.
Rudeness is the weak man's imitation of strength.
I have encountered a lot of rude and insensitive people here in the U.S; people who are careless with their words and actions, and who do not care about hurting other people's feelings.
In childhood, we were taught to treat people with kindness and respect, to learn how to say "I'm sorry" when we hurt somebody, and to be careful with the words that come out of our mouths. However, as we grow older, some of us either forget or take for granted the values that our parents taught us or the things we learned in our Character Education class. Being rude is either a sign of a person's lack of character or improper upbringing.